After living most of her life in foster care, Dorinda knows she should be happy when her sister Tiffany is adopted by a rich family. But no matter how hard she tries, she can't help but feel jealous of Tiff's new clothes, new apartment, and fancy new keyboard. But when they start playing music together, they find they have the kind of musical connection Dorinda never thought possible.Their chemistry is so natural that Tiffany doesn't think twice before asking to join up with Dorinda's superfabulous girl group, the Cheetah Girls. But will adding a new member upset the balance of the band? Dorinda must choose between her fellow Cheetahs and the sister she thought she had lost forever.